| Potomac to Somersworth (New Hampshire) | 439.74 mi (707.69 km) |
| Potomac to Somerton (Arizona) | 2,132.08 mi (3,431.25 km) |
| Potomac to Somerville (Massachusetts) | 395.16 mi (635.95 km) |
| Potomac to Somerville (New Jersey) | 174.30 mi (280.51 km) |
| Potomac to Sonoma (California) | 2,417.26 mi (3,890.21 km) |
| Potomac to Soquel (California) | 2,415.82 mi (3,887.89 km) |
| Potomac to South Bend (Indiana) | 511.77 mi (823.61 km) |
| Potomac to South Bradenton (Florida) | 856.35 mi (1,378.17 km) |
| Potomac to South Burlington (Vermont) | 428.44 mi (689.51 km) |
| Potomac to South Charleston (West Virginia) | 248.21 mi (399.46 km) |
| Potomac to South Daytona (Florida) | 714.35 mi (1,149.64 km) |
| Potomac to South El Monte (California) | 2,274.71 mi (3,660.79 km) |
| Potomac to South Elgin (Illinois) | 618.75 mi (995.78 km) |
| Potomac to South Euclid (Ohio) | 286.62 mi (461.27 km) |
| Potomac to South Farmingdale (New York) | 230.92 mi (371.63 km) |
